CN112672480B - Phase-cut dimming circuit control method, phase-cut dimming circuit and lamp - Google Patents
Phase-cut dimming circuit control method, phase-cut dimming circuit and lamp Download PDFInfo
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- CN112672480B CN112672480B CN202011506014.2A CN202011506014A CN112672480B CN 112672480 B CN112672480 B CN 112672480B CN 202011506014 A CN202011506014 A CN 202011506014A CN 112672480 B CN112672480 B CN 112672480B
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Abstract
The invention is suitable for the technical field of illumination, and provides a phase-cut dimming circuit control method, a phase-cut dimming circuit and a lamp, wherein the phase-cut dimming circuit control method comprises the following steps: after alternating current is electrified, setting the duty ratio of the PWM signal as an initial duty ratio, and continuously sending the PWM signal to the phase-cut dimming module; and acquiring the direct current supply voltage of the phase-cut dimming module, gradually increasing the duty ratio of the PWM signal until the direct current supply voltage is equal to the preset voltage, and taking the value obtained by subtracting the preset difference value from the duty ratio of the current PWM signal as the maximum duty ratio of the PWM signal. The invention adaptively adjusts the maximum duty ratio of the PWM signal according to the main current supply voltage, ensures that the phase-cut dimming circuit does not flash when the maximum duty ratio is output, and improves the user experience.
Description
Technical Field
The invention belongs to the technical field of illumination, and particularly relates to a phase-cut dimming circuit control method, a phase-cut dimming circuit and a lamp.
Background
The back edge phase-cut dimming circuit cuts off a part of sine wave voltage input by a power grid by controlling the conduction angle of the transistor at the back half edge of the voltage so as to reduce the average value of the output voltage and control the power supply voltage of a light source, thereby realizing the purpose of dimming. The back edge phase-cut dimming circuit is compatible with various light sources, and simultaneously reduces surge current and electromagnetic interference, so that the back edge phase-cut dimming circuit is widely applied to the field of illumination.
In the prior art, referring to fig. 1 and 2, when the duty ratio of the PWM signal output by the dimming control module reaches a certain value, due to the existence of the drain voltage, the power supply is insufficient, and the device is powered down to cause a flash. Due to different leakage currents of different light sources, the maximum limit of the duty ratio of the PWM signal when the dimming circuit drives different light sources is also different, which causes poor compatibility of the dimming circuit and affects user experience.
Disclosure of Invention
In view of this, embodiments of the present invention provide a phase-cut dimming circuit, and a lamp, so as to solve the problem in the prior art that due to the influence of a drain voltage, a maximum limit of a duty ratio of a PWM signal cannot be determined, so that compatibility of the dimming circuit is poor, and user experience is influenced.
A first aspect of an embodiment of the present invention provides a method for controlling a phase-cut dimming circuit, where the phase-cut dimming circuit includes: the device comprises a phase-cut dimming module, a voltage detection module and a dimming control module;
the input end of the phase-cut dimming module is connected with an alternating current power supply, and the output end of the phase-cut dimming module is used for driving a light source to emit light; the input end of the voltage detection module is connected with the phase-cut dimming module, and the output end of the voltage detection module is connected with the input end of the dimming control module; the output end of the dimming control module is connected with the phase-cut dimming module;
the phase-cut dimming circuit control method is applied to a dimming control module and comprises the following steps:
when the input end of the phase-cut dimming module is powered on, setting the duty ratio of the PWM signal as the initial duty ratio, and continuously sending the PWM signal to the phase-cut dimming module;
acquiring direct current voltage; the direct-current voltage is the direct-current power supply voltage of the phase-cut dimming module detected by the voltage detection module; when the duty ratio of the PWM signal is the initial duty ratio, the direct current voltage is larger than the preset voltage;
gradually increasing the duty ratio of the PWM signal until the direct-current voltage is equal to the preset voltage, and taking the duty ratio of the current PWM signal as an intermediate duty ratio;
and taking the value obtained by subtracting the preset difference value from the intermediate duty ratio as the maximum duty ratio of the PWM signal.
A second aspect of an embodiment of the present invention provides a phase-cut dimming circuit, including: the phase-cut dimming circuit comprises a phase-cut dimming module, a voltage detection module and a dimming control module applying the phase-cut dimming circuit control method provided by the first aspect of the embodiment of the invention.
A third aspect of the embodiments of the present invention provides a luminaire including the phase-cut dimming circuit as provided in the second aspect of the embodiments of the present invention.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a dimming control module, the steps of the phase-cut dimming circuit control method according to the first aspect of the embodiments of the present invention are implemented.
The embodiment of the invention provides a phase-cut dimming circuit control method, which comprises the following steps: after alternating current is electrified, setting the duty ratio of the PWM signal as an initial duty ratio, and continuously sending the PWM signal to the phase-cut dimming module; and acquiring the direct current supply voltage of the phase-cut dimming module, wherein the direct current supply voltage is greater than the preset voltage, which indicates that the phase-cut dimming module supplies power normally, and then gradually increasing the duty ratio of the PWM signal until the direct current supply voltage is equal to the preset voltage. At the moment, the duty ratio of the PWM signal reaches the maximum, if the duty ratio of the PWM signal is continuously increased at the moment, the power supply of the phase-cut dimming module is abnormal, and the lamp flashes. And the value obtained by subtracting the preset difference value from the duty ratio of the current PWM signal is used as the maximum duty ratio of the PWM signal, so that the phase-cut dimming circuit does not flash while the maximum duty ratio output as far as possible is ensured. According to the embodiment of the invention, the maximum duty ratio of the PWM signal is adaptively adjusted according to the DC supply voltage during AC power-on every time, the maximum duty ratio output of the phase-cut dimming circuit is ensured, and the lamp is not flashed at the same time, so that different light sources are compatible, the compatibility and stability of the circuit are improved, and the user experience is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a graph of a prior art late dimming phase-cut waveform in the absence of drain voltage;
FIG. 2 is a graph of a prior art late dimming phase-cut waveform in the presence of drain voltage;
fig. 3 is a schematic circuit diagram of a phase-cut dimming circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating an implementation flow of a phase-cut dimming circuit control method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a phase-cut dimming circuit control apparatus according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a terminal device provided in an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a voltage detection module according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 3 and 4, an embodiment of the present invention provides a method for controlling a phase-cut dimming circuit, where the phase-cut dimming circuit includes: the phase-cut dimming module 1, the voltage detection module 2 and the dimming control module 40;
the phase-cut dimming module 1 has an input end connected with an alternating current power supply and an output end used for driving the light source 3 to emit light; the input end of the voltage detection module 2 is connected with the phase-cut dimming module 1, and the output end of the voltage detection module is connected with the input end of the dimming control module 40; the output end of the dimming control module 40 is connected with the phase-cut dimming module 1;
the phase-cut dimming circuit control method is applied to the dimming control module 40, and comprises the following steps:
step S101: when the input end of the phase-cut dimming module 1 is powered on, setting the duty ratio of the PWM signal as the initial duty ratio, and continuously sending the PWM signal to the phase-cut dimming module 1;
step S102: acquiring direct current voltage; the direct-current voltage is the direct-current power supply voltage of the phase-cut dimming module 1 detected by the voltage detection module 2; when the duty ratio of the PWM signal is the initial duty ratio, the direct current voltage is larger than the preset voltage;
step S103: gradually increasing the duty ratio of the PWM signal until the direct-current voltage is equal to the preset voltage, and taking the duty ratio of the current PWM signal as an intermediate duty ratio;
step S104: and taking the value obtained by subtracting the preset difference value from the intermediate duty ratio as the maximum duty ratio of the PWM signal.
The PWM signal output by the dimming control module 40 acts on the transistors in the phase-cut dimming module 1 to control the conduction angles of the transistors, thereby controlling the supply voltage of the light source 3. The phase-cut dimming circuit should have compatibility as the driving of the light source 3, and can drive different kinds of light sources 3. However, the PWM signal duty ratios of the phase-cut dimming circuit cannot be unified due to different leakage currents of different light sources 3. If set too high, flashing will occur for some of the light sources 3; if the setting is low, the maximum output cannot be guaranteed. In the embodiment of the invention, the phase-cut dimming circuit firstly sets an initial value for the PWM signal when alternating current is electrified every time, then gradually increases the duty ratio of the PWM signal until the power supply of the phase-cut dimming circuit is abnormal, and slightly reduces the maximum duty ratio as the PWM signal on the basis of the current PWM signal duty ratio, so that the phase-cut dimming module 1 can ensure the maximum output and cannot generate flash lamps, the maximum limit value of the PWM signal is adaptively adjusted, different light sources 3 can be compatible, the compatibility and the stability of the circuit are improved, and the user experience is improved. And if the initial duty ratio is set to be too high, and the direct-current voltage is smaller than the preset voltage at the initial duty ratio, the method is invalid.
In some embodiments, step S103 may include:
step S1031: and gradually increasing the duty ratio of the PWM signal according to a preset step length.
According to the embodiment of the invention, the duty ratio of the PWM signal can be gradually increased according to the fixed step length and slowly approaches the maximum limit value, so that the maximum limit value of the duty ratio of the PWM signal can be accurately obtained. The preset step length can be set according to actual conditions, and it should be understood that all preset step lengths capable of meeting the requirements are within the protection scope of the embodiment of the present invention.
In some embodiments, the preset step size is 1%.
In some embodiments, the initial duty cycle ranges from 5% to 25%.
In some embodiments, the predetermined difference is in the range of 5% to 10%.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Referring to fig. 5, an embodiment of the present invention further provides a phase-cut dimming circuit control apparatus, where the phase-cut dimming circuit includes: the phase-cut dimming module 1, the voltage detection module 2 and the dimming control module 40;
the phase-cut dimming module 1 has an input end connected with an alternating current power supply and an output end used for driving the light source 3 to emit light; the input end of the voltage detection module 2 is connected with the phase-cut dimming module 1, and the output end of the voltage detection module is connected with the input end of the dimming control module 40; the output end of the dimming control module 40 is connected with the phase-cut dimming module 1;
the phase-cut dimming circuit control device comprises:
the initialization module 21 is configured to set a duty ratio of the PWM signal to an initial duty ratio after the input terminal of the phase-cut dimming module 1 is powered on, and continuously send the PWM signal to the phase-cut dimming module 1;
a dc voltage obtaining module 22, configured to obtain a dc voltage; the direct-current voltage is the direct-current power supply voltage of the phase-cut dimming module 1 detected by the voltage detection module 2; when the duty ratio of the PWM signal is the initial duty ratio, the direct-current voltage is larger than the preset voltage;
the duty ratio adjusting module 23 is configured to gradually increase the duty ratio of the PWM signal until the dc voltage is equal to the preset voltage, and use the duty ratio of the current PWM signal as an intermediate duty ratio;
and a duty ratio determining module 24, configured to use a value obtained by subtracting a preset difference from the intermediate duty ratio as the maximum duty ratio of the PWM signal.
In some embodiments, the duty cycle adjusting module 23 may include:
a duty ratio increasing unit 231 for increasing the duty ratio of the PWM signal step by a preset step.
In some embodiments, the preset step size is 1%.
In some embodiments, the initial duty cycle ranges from 5% to 25%.
In some embodiments, the predetermined difference is in a range of 5% to 10%.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the foregoing division of each functional unit and module is merely used for illustration, and in practical applications, the foregoing function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the terminal device is divided into different functional units or modules to perform all or part of the above-described functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the above-mentioned apparatus may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Fig. 6 is a schematic block diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 6, the terminal device 4 of this embodiment includes: a dimming control module 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the dimming control module 40. The dimming control module 40 implements the steps in the above-described embodiments of the phase-cut dimming circuit control method, such as steps S101 to S104 shown in fig. 4, when executing the computer program 42. Alternatively, the dimming control module 40 implements the functions of the modules/units in the phase-cut dimming circuit control apparatus embodiment, such as the functions of the modules 21 to 24 shown in fig. 5, when executing the computer program 42.
Illustratively, the computer program 42 may be partitioned into one or more modules/units, which are stored in the memory 41 and executed by the dimming control module 40 to complete the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 42 in the terminal device 4. For example, the computer program 42 may be divided into an initialization module 21, a direct current voltage acquisition module 22, a duty cycle adjustment module 23, and a duty cycle determination module 24.
The initialization module 21 is configured to set a duty ratio of the PWM signal to an initial duty ratio after the input terminal of the phase-cut dimming module 1 is powered on, and continuously send the PWM signal to the phase-cut dimming module 1;
a dc voltage obtaining module 22, configured to obtain a dc voltage; the direct-current voltage is the direct-current power supply voltage of the phase-cut dimming module 1 detected by the voltage detection module 2; when the duty ratio of the PWM signal is the initial duty ratio, the direct current voltage is larger than the preset voltage;
the duty ratio adjusting module 23 is configured to gradually increase the duty ratio of the PWM signal until the dc voltage is equal to the preset voltage, and use the duty ratio of the current PWM signal as an intermediate duty ratio;
and a duty ratio determining module 24, configured to use a value obtained by subtracting a preset difference from the intermediate duty ratio as the maximum duty ratio of the PWM signal.
The terminal device 4 includes, but is not limited to, a dimming control module 40 and a memory 41. Those skilled in the art will appreciate that fig. 6 is merely an example of a terminal device and does not constitute a limitation of terminal device 4, and may include more or fewer components than shown, or some components may be combined, or different components, e.g., terminal device 4 may also include an input device, an output device, a network access device, a bus, etc.
The dimming control module 40 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 41 may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory 41 may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory 41 may also include both an internal storage unit of the terminal device and an external storage device. The memory 41 is used for storing the computer program 42 and other programs and data required by the terminal device. The memory 41 may also be used to temporarily store data that has been output or is to be output.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed terminal device and method may be implemented in other ways. For example, the above-described terminal device embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the methods of the embodiments described above can be implemented by a computer program, and the computer program can be stored in a computer readable storage medium, and when the computer program is executed by the dimming control module 40, the steps of the embodiments of the methods described above can be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer-readable medium may contain suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media excludes electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
Corresponding to the phase-cut dimming circuit control method, referring to fig. 3, an embodiment of the present invention further provides a phase-cut dimming circuit, including: the phase-cut dimming module 1, the voltage detection module 2 and the dimming control module 40 applying the phase-cut dimming circuit control method provided by the above embodiments.
Referring to the above embodiments, the connection relationship between the modules is not described herein again.
In some cases, the phase-cut dimming module 1 may further include: a zero-crossing detection module;
and the input end of the zero-crossing detection module is connected with the input end of the phase-cut dimming module 1, and the output end of the zero-crossing detection module is connected with the dimming control module 40, and is used for performing zero-crossing detection on the alternating current signal and sending the zero-crossing detection signal to the dimming control module 40.
The above-described zero-cross detection signal serves as a reference point for the PWM signal output.
The input end of the phase-cut dimming module can be determined to be powered on through the zero-crossing detection module, or the input end of the dimming module can be determined to be powered on through the alternating current detection module.
In some embodiments, the phase-cut dimming module 1 may further include: an ACDC module and a DCDC module;
and the input end of the ACDC module is connected with the input end of the phase-cut dimming module 1, and the output end of the ACDC module is respectively connected with the input end of the DCDC module and the input end of the voltage detection module 2 and used for generating direct-current supply voltage.
And the output end of the DCDC module is connected with a low-voltage power supply end VDD.
The low voltage supply terminal VDD may be used to supply power to the dimming control module 40.
In some embodiments, referring to fig. 7, the voltage detection module 2 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a capacitor C1 and a switching tube Q1;
a control end of the switching tube Q1 is respectively connected with a second end of the first resistor R1 and a first end of the second resistor R2, the first end is connected with the low-voltage power supply end VDD, and the second end is respectively connected with a first end of the third resistor R3, a first end of the capacitor C1 and an output end of the voltage detection module 2;
the first end of the first resistor R1 is connected with the input end of the voltage detection module 2;
the second end of the second resistor R2, the second end of the third resistor R3, and the second end of the capacitor C1 are all grounded.
In some embodiments, the switching tube Q1 is a PNP-type triode;
and the emitting electrode of the triode is connected with the first end of the switching tube Q1, the base electrode of the triode is connected with the control end of the switching tube Q1, and the collector electrode of the triode is connected with the second end of the switching tube Q1.
Referring to fig. 7, the dc supply voltage is divided by the first resistor R1 and the second resistor R2 and then input to the base of the triode, when the dc supply voltage is greater than the preset voltage, the triode is turned off, and the voltage detection module 2 outputs a low level; when the direct current supply voltage is smaller than the preset voltage, the triode is conducted, and the voltage detection module 2 outputs a high level; the duty ratio of the PWM signal is not increased when the dimming control module 40 detects the high level.
In the embodiment of the present invention, the dimming control module 40 may set an interrupt, and trigger the interrupt when the voltage detection module 2 outputs a high level.
Corresponding to any of the phase-cut dimming circuits, the novel embodiment of the invention further provides a lamp, which comprises any of the phase-cut dimming circuits and has the advantages of the phase-cut dimming circuits, and the description is omitted here.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A phase-cut dimming circuit control method is characterized in that the phase-cut dimming circuit comprises: the device comprises a phase-cut dimming module, a voltage detection module and a dimming control module;
the input end of the phase-cut dimming module is connected with an alternating current power supply, and the output end of the phase-cut dimming module is used for driving a light source to emit light; the input end of the voltage detection module is connected with the phase-cut dimming module, and the output end of the voltage detection module is connected with the input end of the dimming control module; the output end of the dimming control module is connected with the phase-cut dimming module;
the phase-cut dimming circuit control method is applied to the dimming control module, and comprises the following steps:
after the input end of the phase-cut dimming module is powered on, setting the duty ratio of a PWM signal as an initial duty ratio, and continuously sending the PWM signal to the phase-cut dimming module;
acquiring direct current voltage; the direct-current voltage is the direct-current power supply voltage of the phase-cut dimming module detected by the voltage detection module; when the duty ratio of the PWM signal is the initial duty ratio, the direct current voltage is larger than a preset voltage;
gradually increasing the duty ratio of the PWM signal until the direct current voltage is equal to the preset voltage, and taking the duty ratio of the current PWM signal as an intermediate duty ratio;
and taking the value obtained by subtracting a preset difference value from the intermediate duty ratio as the maximum duty ratio of the PWM signal.
2. The phase-cut dimming circuit control method of claim 1, wherein the step-increasing the duty cycle of the PWM signal comprises:
and gradually increasing the duty ratio of the PWM signal according to a preset step length.
3. The phase-cut dimming circuit control method according to claim 2, wherein the preset step size is 1%.
4. The phase-cut dimming circuit control method according to claim 1, wherein the initial duty ratio ranges from 5% to 25%.
5. The phase-cut dimming circuit control method according to any one of claims 1 to 4, wherein the preset difference value ranges from 5% to 10%.
6. A phase-cut dimming circuit, comprising: the phase-cut dimming module, the voltage detection module and the dimming control module applying the phase-cut dimming circuit control method according to any one of claims 1 to 5.
7. The phase-cut dimming circuit of claim 6, wherein the voltage detection module comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a capacitor and a switching tube;
the control end of the switching tube is respectively connected with the second end of the first resistor and the first end of the second resistor, the first end of the switching tube is connected with the low-voltage power supply end, and the second end of the switching tube is respectively connected with the first end of the third resistor, the first end of the capacitor and the output end of the voltage detection module;
the first end of the first resistor is connected with the input end of the voltage detection module;
and the second end of the second resistor, the second end of the third resistor and the second end of the capacitor are all grounded.
8. The phase-cut dimming circuit of claim 7, wherein the switching tube is a PNP type triode;
and the emitting electrode of the triode is connected with the first end of the switch tube, the base electrode of the triode is connected with the control end of the switch tube, and the collector electrode of the triode is connected with the second end of the switch tube.
9. A luminaire comprising a phase-cut dimming circuit as claimed in any one of claims 6 to 8.
10. A computer-readable storage medium, in which a computer program is stored, wherein the computer program, when being executed by a dimming control module, implements the steps of the phase-cut dimming circuit control method according to any one of claims 1 to 5.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651614A (en) * | 2011-02-28 | 2012-08-29 | 株式会社理光 | Constant voltage power supply device |
| CN109922569A (en) * | 2019-03-25 | 2019-06-21 | 江苏能电科技有限公司 | LED dimming control system and method |
| CN210298134U (en) * | 2019-03-25 | 2020-04-10 | 江苏能电科技有限公司 | LED dimming control system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651614A (en) * | 2011-02-28 | 2012-08-29 | 株式会社理光 | Constant voltage power supply device |
| CN109922569A (en) * | 2019-03-25 | 2019-06-21 | 江苏能电科技有限公司 | LED dimming control system and method |
| CN210298134U (en) * | 2019-03-25 | 2020-04-10 | 江苏能电科技有限公司 | LED dimming control system |
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